What I do is take a plastic Ziploc container that's had some holes cut in the lid. I do four holes: one in each corner that's big enough for them to stick the tip of their nose through. Line the bottom with folded paper towels, and then fill it up with just enough warm water to reach the belly. Then put your leo in and let her soak for 5-10 minutes, longer if the skin has been there for more than a week or so. The humidity will soften the skin even in the face area, so you should be able to pull it off using just your fingers. To get the skin off the toes, roll it off with your fingers. This works better than using tweezers or q-tips.
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chickabowwow

3.2.3 leopard geckos (Rosie, Locke, Lisa, Caesar, Tommy)